Bug Pantheon Login / Hide list Users

Hi!
I need hidden users list on login lightdm.conf
BUT, not working.
I have added lines:

"[SeatDefaults]
greeter-session=pantheon-greeter
user-session=pantheon

greeter-show-manual-login=true
greeter-hide-users=true

allow-guest=false"

At the same Administrador login still showing…

I tried other themes as Unity-greeter, it worked!
But with the Pantheon-greeter does not work

LOGS:
/var/log/lightdm/lightdm.log
[+0.02s] DEBUG: Logging to /var/log/lightdm/lightdm.log
[+0.02s] DEBUG: Starting Light Display Manager 1.2.3, UID=0 PID=933
[+0.02s] DEBUG: Loaded configuration from /etc/lightdm/lightdm.conf
[+0.02s] DEBUG: Using D-Bus name org.freedesktop.DisplayManager
[+0.02s] DEBUG: Registered seat module xlocal
[+0.02s] DEBUG: Registered seat module xremote
[+0.02s] DEBUG: Adding default seat
[+0.02s] DEBUG: Starting seat
[+0.02s] DEBUG: Starting new display for greeter
[+0.02s] DEBUG: Starting local X display
[+0.02s] DEBUG: X server :0 will replace Plymouth
[+0.04s] DEBUG: Using VT 7
[+0.04s] DEBUG: Activating VT 7
[+0.04s] DEBUG: Logging to /var/log/lightdm/x-0.log
[+0.04s] DEBUG: Writing X server authority to /var/run/lightdm/root/:0
[+0.04s] DEBUG: Launching X Server
[+0.04s] DEBUG: Launching process 1044: /usr/bin/X :0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch -background none
[+0.04s] DEBUG: Waiting for ready signal from X server :0
[+0.04s] DEBUG: Acquired bus name org.freedesktop.DisplayManager
[+0.04s] DEBUG: Registering seat with bus path /org/freedesktop/DisplayManager/Seat0
[+0.38s] DEBUG: Got signal 10 from process 1044
[+0.38s] DEBUG: Got signal from X server :0
[+0.38s] DEBUG: Stopping Plymouth, X server is ready
[+0.40s] DEBUG: Connecting to XServer :0
[+0.41s] DEBUG: Starting greeter
[+0.41s] DEBUG: Started session 1809 with service 'lightdm', username 'lightdm'
[+0.64s] DEBUG: Session 1809 authentication complete with return value 0: Success
[+0.64s] DEBUG: Greeter authorized
[+0.64s] DEBUG: Logging to /var/log/lightdm/x-0-greeter.log
[+0.68s] DEBUG: Session 1809 running command /usr/lib/lightdm/lightdm-greeter-session /usr/share/xgreeters/pantheon-greeter
[+1.73s] DEBUG: Greeter connected version=1.2.3
[+1.73s] DEBUG: Greeter connected, display is ready
[+1.73s] DEBUG: New display ready, switching to it
[+1.73s] DEBUG: Activating VT 7

/var/log/lightdm/x-0.log
X.Org X Server 1.11.3
Release Date: 2011-12-16
X Protocol Version 11, Revision 0
Build Operating System: Linux 2.6.42-37-generic x86_64 Ubuntu
Current Operating System: Linux omega 3.2.0-51-generic #77-Ubuntu SMP Wed Jul 24 20:18:19 UTC 2013 x86_64
Kernel command line: BOOT_IMAGE=/boot/vmlinuz-3.2.0-51-generic root=UUID=55114e3c-afb5-45fe-8a30-3d400644817a ro quiet splash vt.handoff=7
Build Date: 11 April 2013 01:05:39PM
xorg-server 2:1.11.4-0ubuntu10.13 (For technical support please see http://www.ubuntu.com/support)
Current version of pixman: 0.24.4
        Before reporting problems, check http://wiki.x.org
        to make sure that you have the latest version.
Markers: (--) probed, (**) from config file, (==) default setting,
        (++) from command line, (!!) notice, (II) informational,
        (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/var/log/Xorg.0.log", Time: Fri Aug 16 09:24:31 2013
(==) Using system config directory "/usr/share/X11/xorg.conf.d"
(II) [KMS] Kernel modesetting enabled.